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AT89C51ID2-RDTIM Datasheet(PDF) 15 Page - ATMEL Corporation

Part # AT89C51ID2-RDTIM
Description  8-bit Flash Microcontroller
PDF  159 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ID2-RDTIM Datasheet(HTML) 15 Page - ATMEL Corporation

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AT89C51ID2
4289A–8051–09/03
Oscillators
Overview
Two oscillators are available for CPU:
•
OSCA used for high frequency: Up to 40 MHz
•
OSCB used for low frequency: 32.768 kHz
Several operating modes are available and programmable by software:
•
to switch OSCA to OSCB and vice-versa
•
to stop OSCA or OSCB to reduce consumption
In order to optimize the power consumption and the execution time needed for a specific
task, an internal prescaler feature has been implemented between the selected oscilla-
tor and the CPU.
Registers
Table 15. CKSEL Register
CKSEL - Clock Selection Register (85h)
Reset Value = 0000 000’HSB.OSC’b (see Hardware Security Byte (HSB))
Not bit addressable
7654
3210
-------
CKS
Bit
Number
Bit
Mnemonic
Description
7-
Reserved
6-
Reserved
5-
Reserved
4-
Reserved
3-
Reserved
2-
Reserved
1-
Reserved
0CKS
CPU Oscillator Select Bit: (CKS)
Cleared, CPU and peripherals connected to OSCB
Set, CPU and peripherals connected to OSCA
Programmed by hardware after a Power-up regarding Hardware Security Byte
(HSB).HSB.OSC (Default setting, OSCA selected)



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